Most of the debate about AI-generated text has focused on what these systems can write. Less attention goes to a quieter question: whether anyone can later tell that a machine wrote it. Anthropic has now given its answer for a larger part of its Claude lineup.
From 30 September 2026, the company will apply its previously announced text watermark to three more models: Claude Fable 5, Claude Sonnet 5 and Claude Opus 4.8. Anthropic shared the news with customers by email. Its stated reason is compliance with the transparency requirements of the EU AI Act.
Most AI announcements are about the model itself: a new release, a better benchmark score, a lower price. Anthropic's latest news is different. It is about what the model found in biological data, and about who did the physical lab work that followed.
Only a week after confirming that it runs a wet biology lab in the Bay Area, Anthropic said the lab had already produced what the company considers a significant result. It describes the find as a new enzyme "system" with "properties reminiscent of CRISPR."
What was found: an enzyme system hidden in viral DNA
CRISPR began as a natural immune system in bacteria, which use it to defend themselves against viruses. Researchers later turned it into a gene-editing technology, and it is now widely used in labs.
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